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Inkjet head

a technology of inkjet head and adhesive, which is applied in the direction of printing and inking apparatus, etc., can solve the problems of affecting the electrical insulation properties of at least one of the piezoelectric elements, affecting the adhesion of adhesive to the upper face (face opposite), and affecting the mechanical strength of the piezoelectric elemen

Active Publication Date: 2008-11-25
BROTHER KOGYO KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]Accordingly, an object of the present invention is to provide an inkjet head wherein covering of a wide range of the end face of the actuator units with a resin film such as an adhesive film can be facilitated and formation of adhesive film on the upper surface of the actuator units can be made more difficult.

Problems solved by technology

Patent Document discloses no technique whereby covering of a wide range of the end face of the piezoelectric element with adhesive can be facilitated and adhesion of adhesive to the upper face (face opposite to the face that is stuck onto the channel-forming substrate) of the piezoelectric elements can be made more difficult.
Consequently, when the technique described in Patent Document 1 is applied to an inkjet head having actuator units as described in Patent Document 2, exposed regions may be produced in which a wide range of the end faces of the actuator units is not covered by adhesive, and this may result in impairment of at least one of the electrical insulation properties, resistance to humidity or mechanical strength.
Furthermore, it is possible for adhesive to adhere to the upper face of the actuator units, leading to obstruction of drive of the actuator units.

Method used

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Examples

Experimental program
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first embodiment

[0022]First of all, an inkjet head according to a first embodiment of the present invention will be described. FIG. 1 shows a printer 1 including an inkjet head 2 according to this embodiment. The printer shown in FIG. 1 is a line head type color inkjet printer having four fixed inkjet heads 2 of rectangular shape in plan view elongated in a direction orthogonal to the plane of FIG. 1. The printer 1 is provided with a paper feed device 114 at the bottom in the Figure, a paper receiving section 116 at the top in the Figure and a paper feed unit 120 at the middle in the Figure, respectively. In addition, the printer 1 comprises a control section 100 that controls the operation of these.

[0023]The paper feed device 114 comprises a paper sheet accommodating section 115 capable of accommodating a plurality of stacked rectangular printing paper sheets P and paper feed roller 145 that feeds the uppermost sheet of printing paper P in the paper sheet accommodating section 115, one sheet at ti...

second embodiment

[0068]Next, an inkjet head according to a second embodiment of the present invention is described below with reference to FIG. 12. The inkjet head according to this embodiment differs from the inkjet head 2 of the first embodiment solely in that a step is formed on the end face of the actuator unit. The following description will therefore focus on the differences between these two. Also, members which are the same as in the description of the first embodiment are given the same reference symbols and further description thereof is dispensed with.

[0069]As shown in FIG. 12, in an inkjet head according to this embodiment, an actuator unit 71 comprises four piezoelectric sheets 41′, 42, 43, 44 of the same thickness. The piezoelectric sheet 41′ is of slightly smaller planar size than the remaining three piezoelectric sheets 42 to 44. A step having an upwardly directed step face 71c is therefore formed over the entire periphery in the end face 71a of the actuator unit 71. A common electro...

example 1

[0073]The state of sealing of the end face 21a and the state of adhesion of adhesive onto the upper face 21b of the actuator unit 21 were observed when only the thickness of the actuator unit 21 was varied in nine steps, namely, 10, 15, 20, 25, 40, 80, 100, 110, and 150 μm in an inkjet head 2 as described in the first embodiment. The results are shown in Table 1. The details of the inkjet head 2 that was used were as follows.

[0074]

TABLE 1ActuatorState of adhesionthicknessState of sealingof adhesive on(μm)of end faceupper faceEvaluation10good sealingadhesion in apoorwide range15good sealingpartial adhesionmoderate20good sealingno adhesiongood25good sealingno adhesiongood40good sealingno adhesiongood80good sealingno adhesiongood100good sealingno adhesiongood110some poorno adhesionmoderatesealing150poor sealingno adhesionpoor

[0075]In Table 1, “good sealing” means that sealing is effected uniformly without exposure of the end faces over the entire region. As can be seen from Table 1, th...

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Abstract

An inkjet head has: a channel unit having a plurality of nozzles and a plurality of pressure chambers respectively communicating with the nozzles; and an actuator unit on the channel unit and having a piezoelectric sheet, a plurality of individual electrodes respectively arranged to positionally correspond to the pressure chambers respectively and a common electrode sandwiching the piezoelectric sheet together with the plurality of individual electrodes. The actuator unit has a thickness of 20 μm to 100 μm and a surface roughness of the end face of the actuator unit including an intersection with channel unit and the actuator unit is 0.15 μm to 0.5 μm, and at least part of the end face is sealed by a resin film.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an inkjet head comprising nozzles that discharge ink.[0003]2. Description of the Related Art[0004]An inkjet head distributes ink supplied from an ink tank to a plurality of pressure chambers. Ink that is distributed to the pressure chambers is pressurized by actuators and discharged from nozzles communicating with these pressure chambers. Piezoelectric elements including piezoelectric ceramic may be employed as the actuators. Japanese Patent Application Laid-open No. 2003-341056 (FIG. 3, paragraph number 0066; hereinafter referred to as “Patent Document 1”) discloses a technique wherein, in an inkjet head employing piezoelectric elements as actuators, the side face of a piezoelectric element is covered by adhesive that is used to stick together the piezoelectric element and a channel-forming substrate in which pressure chambers are formed. With the technique disclosed in Patent Document ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B41J2/045
CPCB41J2/14209B41J2/1609B41J2/1623B41J2/1632B41J2002/14217B41J2002/14225B41J2002/14306B41J2002/14459B41J2002/14491B41J2202/20
Inventor SAKAIDA, ATSUOSAKAI, HISAMITSUAIDA, HIROSHIISHIKURA, SHIN
Owner BROTHER KOGYO KK
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